Esp32 Jk Pb Modbus Example Modbus Register 4744: Name cell 32 wire resistance

Technical Definition

The register name cell 32 wire resistance at address 4744 is used to monitor name cell 32 wire resistance on the Esp32 Jk Pb Modbus Example.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Ω
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read name cell 32 wire resistance (Address: 4744)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4744, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "name cell 32 wire resistance"
  address: 4744
  value_type: U_WORD
  unit_of_measurement: "Ω"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 Jk Pb Modbus Example]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Resistance of cell 32's wiring. Measured in Ohms (Ω).

Troubleshooting: High values indicate poor connections or damaged wires. Zero could mean a short circuit or sensor failure.